Best crawler - Mini Rock Crawler
Best Oval - Mini Slider
Best Late - Mini Late
Best 2wd - Mini Desert
Best Basher - Mini LST2
Best Monster (on the cheap) - Mini Ram
Best bang for buck - Mini T
Kidding aside, I would go with the Mini LST2. Do not get the Mini LST1 if you can find it. The LST2 is a much better buy. The Mini Rams only come with one motor. I think Losi still has the LiPo give-away going on. You could also get the Associated M18T RTR for around $200.